If you have limited experience with this sort of thing, don't dissasemble the revolver completely. Parts may be hard to come by since they're not made anymore. I'd do what Carmady suggested and go from there. The gun may just need some oil in the right spots, and some crud flushed out of it. I'd take the grips off and cycle the gun slowly by pulling back on the hammer, then pulling the trigger and letting the hammer down slowly to see what's going on, and how the gun works in general. Just don't dry fire the gun too much, as it can be damaged by doing so.

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Regret for the things we did can be tempered by time; it is regret for the things we did not do that is inconsolable."
-Sydney J. Harris